From memory, I use a constant into a dither, desaturated a bit, then use
several noise nodes to matte out the dots.
Also I've taken actual star field photos blurred and keyed, to gamma up
sections of the above, which can get around the lack of resolution in the star
plate.
Howard
On 23 Aug 2012, at 04:31, Frank Rueter <fr...@beingfrank.info> wrote:
> one of many ways of doing this:
> play with a Noise node set to size of 1. Follow up with a Grade node and use
> it's black and white point as well as gamma to adjust how many dots you get,
> follow with a Glint node for star shapes.
>
> You can then use a larger, animated noise pattern to slightly multiply the
> original one by to get some atmospheric pulsing.
>
> quick and dirty:
>
> Noise {
> inputs 0
> zoffset {{frame/300 i}}
> center {1024 778}
> name Noise2
> selected true
> xpos -272
> ypos -222
> }
> push $cut_paste_input
> Noise {
> size 1
> gain 1
> gamma 0.1
> center {1024 778}
> name Noise1
> selected true
> xpos -162
> ypos -246
> }
> Merge2 {
> inputs 2
> operation multiply
> mix 0.79
> name Merge1
> selected true
> xpos -162
> ypos -222
> }
> Grade {
> blackpoint 0.1
> whitepoint 0.2
> name Grade1
> selected true
> xpos -162
> ypos -173
> }
> Glint {
> repeat 5
> length 7
> tolerance 0.1
> name Glint1
> selected true
> xpos -162
> ypos -119
> }
>
>
>
> On 23/08/12 3:15 PM, gridwarped wrote:
>> I'm not sure where to start on creating a gizmo that generates random dots
>> that can be used as a star field. Being able to generate the dots and the
>> density (how many) is beyond my knowledge and creative understanding at the
>> moment.
>>
>> is this a python scripting only scenario? or is there a way that I may be
>> overlooking using a few nodes? Any help is appreciated.
>>
>>
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